The naked snail or naked snail & x28;English: slug& x29; is a common name for terrestrial gastropod mollusks that appear to be shell-less. The term & x27;naked snail& x27; is also often used as part of the common name of shell-less or very small-shelled or only small internal-shelled gastropod mollusks, especially sea snails and semi-snails & x28;this is different from the common name & x27; snail& x27;& x29;, it applies to gastropods that have a large circular shell so that they can fully retract their soft parts into it.